638 



NATURE 



[February 4, 19 15 



An Introduction to the Study of Colour Vision. By 

 Dr. J. H. Parsons. Pp. viii + 308. (Cambridge Uni- 

 versity Press.) I2S. 6d. net 



Smithsonian Miscellaneous Collections. Vol. Ixiii., 

 No. 8. Explorations and Field-Work of the Smith- 

 sonian Institution in 1913. Pp. 88. Vol. Ixiii., No. 9. 

 The Olfactory Sense of Insects. Bv Dr. N. E. 

 Mclndoo. Pp. 63. (Washington : Smithsonian Insti- 

 tution.) 



Insects and Man. By C. A. Ealand. Pp. 343. 

 (London : Grant Richards, Ltd.) 125. net. 



An Atlas of Economic Geography. By Dr. J. G. 

 Bartholomew, with Introduction by Prof. L. W. Lyde. 

 Pp. lxvi + 96 pages and of maps. (London : Oxford 

 University Press.) 55. net. 



Determinacion de la Hora por Alturas Absolutas, 

 Correspondlentes 6 Iguales de Distintas Estrellas. By 

 C. Puente. Pp. 211. (Madrid : Bailly-Bailliere.) 



The Principles of Understanding : An Introduction 

 to Logic from the Standpoint of Personal Idealism. 

 By H. Sturt. Pp. xiv + 302. (Cambridge University 

 Press.) 55. net. 



Oxford Outline Maps. Nine (various). (Oxford : 

 Clarendon Press.) id. each. 



Alternating-Current Electricity and its Applications 

 to Industrv. First Course. By W. H. Timbie and 

 Prof. H. H. Higbie. Pp. x-l-'534. (New York : J. 

 Wilev and Sons, Inc. ; London : Chapman and Hall, 

 Ltd.) 85. 6d. net. 



Studies of Trees. By J. J. Levison. Pp. x + 253. 

 (New York : J. Wiley and Sons, Inc. ; London : Chap- 

 man and Hall, Ltd.) 75. net. 



Air, Water, and Food, from a Sanitary Standpoint. 

 By A. G. Woodman and J. F. Norton. Fourth 

 edition. Pp. v + 248. (New York : J. Wiley and Sons, 

 Inc. ; London : Chapman and Hall, Ltd.) 8s. 6d. net. 



Electricity in Gases. By Prof. J. S. Townsend. 

 Pp. xv + 4q6. (Oxford: Clarendon Press.) 14s. net. 



The British Journal Photographic Almanac and 

 Photographer's Dailv Companion, 1915. (London : 

 H. Greenwood and Co., Ltd.) \s. net. 



The Vicious Circles of Neurasthenia and their 

 Treatment. By Dr. J. B. Hurry. Pp. xv + 90. (Lon- 

 don : J. and A. Churchill.) 3s. 6d. net. 



The Lonely Nietzsche. By Frau Forster Nietzsche. 

 Translated by P. V. Cohn. Pp. XV4-415. (London : 

 W. Heinemann.) \k,s. net. 



A Text Book of General Physics for College 

 Students : Electricitv, Electromagnetic Waves, and 

 Sound. By Prof, j] A. Culler. Pp. x + 321. (Phil- 

 adelphia and London : J. B. Lippincott Co.) 75. 6d. 

 net. 



The Roval Botanic Society of London Pocket Book. 

 Pp. 62. (London : Royal Botanic Society.) \s. 



DIARY OF SOCIETIES. 



THURSDAY, Februarv 4. 



Roval Society, at 4.30.— Discontinuous Fluid Motion Pa<;t a Bent Plane, 

 with Special Reference to Aeroolane Problems : Prof. G. H. Bryan and 

 R. Tones. — A New Type of Series in the Band Spectrum Associated with 

 Helium : Prof. A. Fowler.— The Spectra of Ordinary Lead and Lead of 

 Radio-active Oiigin: T. R. Merton.— The Viscosity of the Vapour of 

 Iodine : A. O. Rankine. 



Royal Institution, at 3.— Modern Theories and Methods in Medicine 

 Methods and Results : H. G. Plimmer. 



LiNNKAN Society, at 5.— A New, Well-petrified Fossil : Wood or Bark 

 Angiosperm or Gymno«perm ? : Dr. Marie Stopes. — Brachydactyly as an 

 Example of Mendelian Inheritance : Dr. H. Drinkwa'er. 



FRIDAY. February 5. 

 Royal Institution, at 9.— Science and Industrial Problems : Ptof. A. W. 



Crossley. 

 Geologists' Association, at 7.30.— Annual General Meeline.— Presiden- 

 tial Address: Geological History of Flying Vertebrates : G. W. Young. 

 flfOJVDAV, February 8. 

 Royal Geographical Society, at 8.30.— A Seventh Journey in Persia : 

 Col. P. Molesworth Sykes, C.M.G. 



TUESDA Y, February g. 

 Zoological Society, at 5.30.— Exhibition of Skins of Mammals from 

 Sierra Leone : Guy Aylmer. — Exhibitions of Skiagraphs of Foraminifera : 

 E. Heron-Allen. — Report on the Deaths which occurred in the Zoological 



Gardens during 1914 : H. G. Phmmer. — A Colubrid Snake (Xenodon) 



with a Vertically Movable Maxillary Bone : E. G. Boulenger. — A New 



Liver-fluke from the Kestrel : W. Nicoll. 

 Royal Institution, at 3. — Muscle in the Service of Nerve : Prof. C. S. 



Sherrington. 

 Institution of Civil Engineers, at 8. — Engineering Operations for the 



Prevention of Malaria : F. D. Evans. 



IVEDNESDAY, February 10. 

 Royal Society of Arts, at 8.— British Lithography in 1915 : F. V. Brooks. 



THURSDAY, February ii. 

 Royal Society, at 4.30. — Ptobable Papers : Lepidostrobus Keutuckiensis, 



formerly Lepidostrobus Fischeri, Scoit and Jeffrey ; A Correction : Dr. 



D. H. Scott.— The Excitatory Process in the Doe's Heart. _ II. : The 



Ventricles: T. Lewis and M. A. Rothschild. — The Variation in the 



Growth of Mammalian Tissue in vitro according to the Age of the 



Animal : A. J. Walton. 

 Royal Institution, at 3. — Nations as Species : Dr. P. Chalmers Mitchell. 

 Institution of Electrical Engineers at 8.— Condition* Affecting the 



Variation in Strength of Wireless Signals : Prof. E. W. Marchant . 

 Child Study Society, at 6.— With the British Association in Australia: 



Dr. C. W. Kimmins. 

 Royal Society of Arts, at 4.30.— Tribes of the Brahmaputra Valley; 



Capt. Sir George D. Dunbar, Bart. 



FRIDAY, February 12. 

 Royal Institution, at g.— Recent Advances in Oceanography Dr. 



W. S. Bruce. 

 Royal Astronomical Society, at 5. — .Anniversary Meeting. 

 Physical Society, at 8.— Annual General Meeting.— The Criterion of 



Steel Suitable for Permanent Magnets : Prof. Silvanus P. Thompson. — A 



Galvanic Cell which Reverses its Polarity when Illuminated : Alan A. 



Campbell Swinton. — An Investigation on the Photographic Effect of 



Recoil Atoms : A. B. Wood and A. I. Steven. 



CONTENTS. PAGE 



The Web of Life. By Prof. J. Arthur Thomson . 611 



Assaying at the Royal School of Mines. By T. K. R. 612 



Japanese Mathematics. By G. B. M 612 



Practical Education 613 



Our Bookshelf 614 



Letters to the Editor : — 



The Density of Lead from Ceylon Thorite. — 



Prof. Frederick Soddy, F.R.S 615 



The Cause of Streaks upon Lath and Plaster Walls. — 



Dr. John Aitken, F.R.S. ; R. M. Deeley . . 615 

 Adelard of Bath and the Continuity of Universal 



Nature. — Prof. Lynn Thorndike . . . 616 

 The Economic Status of the Blackcap.— Alfred O. 



Walker; Walter E. Collinge 617 



Names in Mechanics. — David Mair 617 



Notes on Stellar Classification. — II. {With Dia- 

 grams.) By Sir Norman Lbckyer, K.C.B., F.R.S. 618 



Trinitrotoluene in the War 620 



Typhoid in the Field 620 



Mr. F. W. Rudler 621 



Notes 621 



Our Astronomical Column :— 



Wolf-Rayet Stars and the Planetary Nebulse .... 626 



The Solar Rotation in 1913 . 626 



" L' Astronomic " for September and October, 1914 627 



The Canadian Astronomical Handbook 627 



Copper Smelting in Canada. By H. L 627 



Agricultural and Horticultural Research 628 



Paris Academy of Sciences. — Prizes Proposed for 



the Year 1916 629 



The English Ceramic Society. By T 630 



Education in Relation to Industry and Commerce. 



By James Graham 630 



University and Educational Intelligence 634 



Societies and Academies 635 



Books Received 637 



Diary of Societies . 638 



ST. 



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Editorial Communications to the Editor. 



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 Telephone Number: Gerrard 8830. 



NO. 2362, VOL. 94] 



